Driving device and camera module

Abstract

This application discloses a driving device and a camera module, belonging to the technical field of camera module technology. The driving device includes a fixed frame, a movable carrier, a driving component, and a supporting component. The movable carrier is movably disposed on the fixed frame. The driving component is connected to the fixed frame and abuts against the movable carrier, applying a preload to the movable carrier and is adapted to drive the movable carrier to move relative to the fixed frame when a driving signal is received. The supporting component includes a first support member and a second support member. The first support member abuts against both the fixed frame and the movable carrier, and the second support member has a certain gap with the fixed frame and / or the movable carrier. The camera module uses the above-described driving mechanism. It has the advantages of reducing the risk of the movable carrier tilting relative to the fixed frame, preventing the movable carrier from jamming with the supporting component, ensuring smooth movement of the movable carrier, and improving image quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of camera modules, in particular to a driving device and a camera module. BACKGROUND

[0002] Electronic devices are usually provided with camera modules. With the improvement of living standards, people pay more and more attention to the performance of camera anti-shake, in order to obtain higher quality photos. People expect to install a camera module with small size, high pixels and anti-shake capability on portable devices such as smart phones, tablet computers and the like to obtain better use experience.

[0003] In the prior art, a lens assembly is arranged on a movable carrier, the movable carrier is movably arranged on a fixed frame, and a driving device is arranged between the movable carrier and the fixed frame. The driving device provides a pre-pressure to the movable carrier on one hand, and drives the movable carrier to displace relative to the fixed frame by friction on the other hand, so as to realize the lens adjustment function. However, due to the existence of the pre-pressure, the movable carrier may be inclined relative to the fixed frame, so that the movable carrier is stuck at a certain position, the lens adjustment function is lost, and the imaging quality of the camera module is reduced. SUMMARY

[0004] One object of the present application is to provide a driving device applied to a camera module, which can reduce the risk of inclination of a movable carrier relative to a fixed frame, and avoid the movable carrier and a supporting assembly from being stuck.

[0005] Another object of the present application is to provide a camera module, in which the movable carrier carrying a lens assembly can be smoothly adjusted, so as to improve the imaging quality.

[0006] To achieve the above objects, the present application adopts the following technical solution: a driving device applied to a camera module, comprising:

[0007] a fixed frame;

[0008] a movable carrier movably arranged on the fixed frame;

[0009] a driving assembly connected with the fixed frame and abutting against the movable carrier, which applies a pre-pressure to the movable carrier and is adapted to drive the movable carrier to move relative to the fixed frame when receiving a driving signal;

[0010] a supporting assembly comprising a first supporting member and a second supporting member, the first supporting member abutting against the fixed frame and the movable carrier respectively, and the second supporting member has a certain gap with the fixed frame and / or the movable carrier.

[0011] As a preference, the support assembly and the drive assembly are disposed on the same side of the drive device.

[0012] As a preference, the first support member and the second support member are disposed on the same side of the drive assembly.

[0013] As a preference, the first support member is closer to the drive assembly than the second support member.

[0014] As a preference, the first support member and the second support member are disposed on opposite sides of the drive assembly.

[0015] As a preference, the first support member, the second support member, and the drive assembly are disposed in a straight line along the pre-pressing direction.

[0016] As a preference, the movable carrier comprises a first outer protrusion, the fixed frame comprises a first inner protrusion, the first outer protrusion and the first inner protrusion are disposed opposite to each other, and the first support member is disposed between the first outer protrusion and the first inner protrusion.

[0017] As a preference, the first outer protrusion is provided with a first guide portion, the first inner protrusion is provided with a second guide portion, the first support member is in abutment with the first guide portion and the second guide portion on both sides, and the first guide portion, the second guide portion, and the first support member cooperate to guide the movement of the movable carrier in a first direction.

[0018] As a preference, the movable carrier further comprises a second outer protrusion, the fixed frame further comprises a second inner protrusion, the second outer protrusion and the second inner protrusion are disposed opposite to each other, and the second support member is disposed between the second outer protrusion and the second inner protrusion.

[0019] As a preference, the second outer protrusion is provided with a third guide portion, the second inner protrusion is provided with a fourth guide portion, the second support member is disposed between the third guide portion and the fourth guide portion, and the third guide portion, the fourth guide portion, and the second support member cooperate to provide a certain space for the adjustment of the movable carrier.

[0020] As a preference, the first support member and the second support member are guide rods, the guide rods are disposed in a first direction, and at least two protrusions adapted to contact the guide rods are spaced apart on the movable carrier in the first direction.

[0021] As a preferred, the driving assembly comprises a pre-pressing assembly and an actuating assembly, the pre-pressing assembly is connected with the fixed frame, the actuating assembly is connected with the pre-pressing assembly, the pre-pressing assembly provides a pre-pressing force to the actuating assembly, the driving end of the actuating assembly abuts against the movable carrier and the pre-pressing force is applied to the movable carrier, so that the actuating assembly is adapted to drive the movable carrier to move relative to the fixed frame when receiving a driving signal.

[0022] As a preferred, the pre-pressing assembly comprises a structure and a buffer, the structure is connected with the fixed frame, the buffer is arranged between the structure and the actuating assembly and is adapted to be deformed by the extrusion of the structure and the actuating assembly.

[0023] To achieve another purpose of the present application, the technical scheme adopted by the present application is as follows: a camera module comprises:

[0024] The driving device described above;

[0025] A lens assembly arranged in the driving device; and

[0026] A photosensitive assembly arranged relative to the lens assembly.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] (1) Under the action of the pre-pressing force of the driving device, the first support abuts against the fixed frame and the movable carrier respectively, the first support is tightly assembled with the fixed frame and the movable carrier, so that the movable carrier is movably supported on the fixed frame and can move smoothly. There is a certain gap between the second support and the fixed frame and / or the movable carrier, that is, the second support is loosely assembled, which can provide a certain space for the adjustment of the movable carrier. In the case that the movable carrier is tilted under the influence of the pre-pressing force, the second support abuts against the fixed frame and the movable carrier, which can correct the movable carrier so that the movable carrier is driven in the expected movement direction.

[0029] (2) The tilt of the movable carrier may further cause the support assembly to be stuck, which in turn causes the movable carrier to be unable to move relative to the fixed frame, and the focusing function cannot be realized. The present application reduces the risk of tilting of the movable carrier and also reduces the probability of the support assembly and the movable carrier being stuck, so that the position of the movable carrier can be smoothly adjusted, the driving device can reliably realize the focusing function, and the photographing effect is improved.

[0030] (3) The arrangement of the support assembly can reduce the frictional contact area between the movable carrier and the fixed frame, which is beneficial to reducing the frictional force received by the movable carrier when moving relative to the fixed frame, and the movable carrier is facilitated to be driven by the driving assembly. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of a drive device in the prior art;

[0032] Figure 2 A schematic diagram illustrating how pre-stress tilting causes the moving carrier to tilt.

[0033] Figure 3 This is a top view of the drive device in a preferred embodiment of this application;

[0034] Figure 4 This is a schematic diagram of the exploded structure of the driving device in a preferred embodiment of this application;

[0035] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure along the AA direction;

[0036] Figure 6 This is a partial structural diagram of the drive device at the first support member;

[0037] Figure 7 This is a partial structural diagram of the drive device at the second support member;

[0038] Figure 8 This is a schematic diagram of a fixed frame structure;

[0039] Figure 9 This is a schematic diagram of the structure of the activity carrier;

[0040] Figure 10 This is a top view of the drive device in another preferred embodiment of this application;

[0041] Figure 11 This is a schematic diagram showing the positions of the support component and the driving component in another preferred embodiment of this application;

[0042] Figure 12 This is an exploded view of the driving component in a preferred embodiment of this application;

[0043] Figure 13 This is a schematic diagram of the driving principle of the actuation component in a preferred embodiment of this application;

[0044] Figure 14 This is a schematic diagram of the driving principle of the actuation component in another preferred embodiment of this application;

[0045] In the figure: 10. Fixed frame; 11. First inner protrusion; 112. Second guide part; 12. First outer concave part; 13. Second inner protrusion; 134. Fourth guide part; 14. Second inner concave part; 15. Opening; 20. Movable carrier; 21. First outer protrusion; 211. First guide part; 22. First inner concave part; 23. Second outer protrusion; 24. Second inner concave part; 233. Third guide part; 26. Wear-resistant part; 201 30. Protrusion; 31. Drive assembly; 32. Preload assembly; 33. Spring; 34. Structural component; 35. Buffer component; 36. Actuation assembly; 37. Flexible circuit board; 38. Piezoelectric vibrator; 39. First side electrode; 30. Second side electrode; 31. Third side electrode; 32. Fourth side electrode; 32. Friction head; 40. Support assembly; 41. First support component; 42. Second support component. Detailed Implementation

[0046] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0047] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0048] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0049] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0050] like Figure 1 , Figure 2As shown, a driving device for a camera module in the prior art includes a fixed frame 10, a movable carrier 20, a driving component 30, and a supporting component 40. The movable carrier 20 is movably disposed on the fixed frame 10. The driving component 30 is connected to the fixed frame 10 and abuts against the movable carrier 20, and is adapted to drive the movable carrier 20 to move relative to the fixed frame 10 when receiving a driving signal. The supporting component 40 is disposed between the fixed frame 10 and the movable carrier 20, so that there is a fixed gap between the opposing surfaces of the fixed frame 10 and the movable carrier 20, which can reduce the frictional force experienced by the movable carrier 20 when it moves relative to the fixed frame 10.

[0051] In some optional embodiments, a lens assembly is mounted on the movable carrier 20. The lens assembly has an optical axis, and the movable carrier 20 moves in a direction parallel to the optical axis to achieve the focusing function.

[0052] Specifically, the driving component 30 is implemented as a piezoelectric actuator. In some specific embodiments, the driving component 30 includes a pre-pressure component 31 and an actuation component 32. The pre-pressure component 31 is connected to the fixed frame 10, and the actuation component 32 is connected to the pre-pressure component 31. The pre-pressure component 31 provides a pre-pressure to the actuation component 32, causing the actuation component 32 to abut against one side of the movable carrier 20. The actuation component 32 includes a piezoelectric vibrator 322 and a friction head 323. The piezoelectric vibrator 322 is connected to the pre-pressure component 31, and the friction head 323 is fixed on the side of the piezoelectric vibrator 322 facing the movable carrier 20. Under the action of the pre-pressure, the friction head 323 abuts against the side wall of the movable carrier 20. That is, the friction head 323 and the pre-pressure component 31 are respectively disposed on opposite sides of the piezoelectric vibrator 322. The piezoelectric vibrator 322 is a substrate exhibiting the inverse piezoelectric effect and contracting or expanding according to the polarization direction and the electric field direction. It can be used by polarizing the substrate in the thickness direction in single crystals, polycrystalline ceramics, polymers, etc. The inverse piezoelectric effect refers to the mechanical deformation of a dielectric when an electric field is applied in the polarization direction of the dielectric, resulting in a potential difference. The piezoelectric vibrator 322 has the function of ultrasonic oscillation, enabling it to achieve oscillating reciprocating motion or elliptical motion on a specifically set electrode layer. This drives the friction head 323 to perform oscillating reciprocating motion or elliptical motion, and then, through the friction between the friction head 323 and the outer wall of the movable carrier 20, it drives the movable carrier 20 to move relative to the fixed frame 10. In other words, the driving force can be understood as the frictional force applied by the friction head 323 to the movable carrier 20.

[0053] There are two support components 40, which are respectively disposed at two opposite corners of the movable carrier 20. From a top view, the support components 40 and the actuation component 32 are arranged at three points on the side wall of the movable carrier 20. In some specific embodiments, the support components 40 are ball bearings or guide rods. It is understood that when the support components 40 are ball bearings, generally a row of ball bearings is disposed at each of the two opposite corners of the movable carrier 20, and the two rows of ball bearings provide a supporting plane for the movable carrier 20.

[0054] It should be noted that the piezoelectric vibrator 322 causes the friction head 323 to move through deformation. When the piezoelectric vibrator 322 deforms, the angle between the friction head 323 and the contact surface of the movable carrier 20 changes accordingly. This results in the preload not always acting perpendicularly to the sidewall of the movable carrier 20, but rather the direction of the preload is inclined relative to the plane containing the sidewall of the movable carrier 20. Simultaneously, when the hardness of the preload component 31 is low, for example, when the preload component 31 is a spring sheet 310, the preload component 31 may bend to a certain extent due to the deformation of the piezoelectric vibrator 322, causing the angle of the preload direction relative to the contact surface to change. In other words, under certain conditions, the direction of the preload is inclined relative to the plane containing the sidewall of the movable carrier 20. In this case, when the actuation component 32 drives the movable carrier 20 to move, it is easy to cause the movable carrier 20 to tilt.

[0055] Among them, such as Figure 2 As shown, when the preload assembly 31 is configured as a spring plate 310, the spring plate 310 is located on the side of the piezoelectric vibrator 322 facing away from the movable carrier 20. The end of the spring plate 310 is fixedly connected to the fixed frame 10, and the middle part of the spring plate 310 abuts against the outer side of the piezoelectric vibrator 322. The preload is provided by the elastic force of the spring plate 310. Since the spring plate 310 has low stiffness and is easy to deform, it will bend after the preload is provided, and the middle part of the spring plate 310 will have an inclination angle, which will cause the piezoelectric vibrator 322 to have an inclination angle relative to the movable carrier 20 that is not preset. For example, ideally, the spring plate 310 is set parallel to the abutment surface of the movable carrier 20 to provide a preload perpendicular to the abutment surface of the movable carrier 20. However, in actual use, the bending of the spring plate 310 causes the piezoelectric vibrator 322 to tilt relative to the movable carrier 20. The preload tilts and acts on the movable carrier 20, causing the movable carrier 20 to tilt.

[0056] In particular, Figure 1When the support components 40 are positioned at two diagonal locations on the movable carrier 20, the distance from the center of frictional contact between the actuation component 32 and the movable carrier 20 to the line connecting the support components 40 at the two diagonal locations is the lever arm x. The overturning moment M of the movable carrier 20 at the diagonal locations is positively correlated with the magnitude of the lever arm x. The three-point arrangement results in a large lever arm x and overturning moment M. When the movable carrier 20 is driven by the actuation component 32, the movable carrier 20 will generate a large tilt angle, causing the movable carrier 20 to tilt and affecting the speed and effect of optical focusing. Furthermore, in this structure where the support components 40 are positioned diagonally, the two diagonal support components 40 may generate uncertain frictional forces, causing the movement stroke and movement speed of the movable carrier 20 to be insufficient. Moreover, the diagonal support components 40 may compress the drive component 30, increasing the frictional force in the support component 40 portion.

[0057] Even worse, when the support component 40 is implemented as a ball bearing, the ball bearing makes point contact with the side walls of the fixed frame 10 and the side walls of the movable carrier 20. Once the movable carrier 20 tilts, at least one of the balls in each support component 40 will not be able to simultaneously abut against the fixed frame 10 and the movable carrier 20, which can easily lead to jamming between the movable carrier 20 and the ball bearing, or the movable carrier 20 falling off from the ball bearing, making it impossible for the movable carrier 20 to continue moving and affecting the focusing effect. Of course, when the support component 40 is implemented as a guide rod, the situation is better than with a ball bearing, but the tilting of the movable carrier 20 will still affect the optical focusing effect.

[0058] To address the aforementioned issues, this application first improves the support structure between the fixed frame 10 and the movable carrier 20, namely the structure related to the support component 40.

[0059] This application provides a driving device for use in a camera module, such as... Figures 3-14 As shown, it includes a fixed frame 10, a movable carrier 20, a drive assembly 30, and a support assembly 40. The movable carrier 20 is movably disposed on the fixed frame 10. The drive assembly 30 is connected to the fixed frame 10 and abuts against the movable carrier 20, applying a preload to the movable carrier 20 and is adapted to drive the movable carrier 20 to move relative to the fixed frame 10 when a drive signal is received. The support assembly 40 includes a first support member 41 and a second support member 42. The first support member 41 abuts against the fixed frame 10 and the movable carrier 20 respectively, and the second support member 42 has a certain gap with the fixed frame 10 and / or the movable carrier 20.

[0060] Combination Figures 5-7As shown, under the action of preload, the first support member 41 simultaneously abuts against the fixed frame 10 and the movable carrier 20, and the first support member 41 is tightly assembled. A certain gap exists between the second support member 42 and the fixed frame 10 and / or the movable carrier 20. This gap provides some leeway for the adjustment of the movable carrier 20; that is, the second support member 42 is loosely assembled. The support principle of this support assembly 40 is as follows: when the movable carrier 20 is driven by the drive assembly 30, the first support member 41 always provides support for the movable carrier 20 to ensure the parallelism of the movement of the movable carrier 20. When the movable carrier 20 is tilted, the gap at the second support member 42 provides some leeway for the position adjustment of the movable carrier 20. Furthermore, when the movable carrier 20 tilts to a certain extent, the two sides of the second support member 42 abut against the fixed frame 10 and the movable carrier 20 respectively, which can correct the movable carrier 20, prevent the movable carrier 20 from tilting, and thus avoid affecting the movement of the movable carrier 20.

[0061] It is understood that the existence of a certain gap between the second support member 42 and the fixed frame 10 and / or the movable carrier 20 includes three situations: the second support member 42 abuts against the fixed frame 10 and there is a gap between it and the movable carrier 20; the second support member 42 abuts against the movable carrier 20 and there is a gap between it and the fixed frame 10; and there are gaps between the second support member 42 and both the fixed frame 10 and the movable carrier 20. As long as the second support member 42 can provide a gap for the movable carrier 20 to adjust, it is acceptable.

[0062] In some optional embodiments, a lens assembly is mounted on the movable carrier 20. The lens assembly has an optical axis, and the movable carrier 20 moves in a direction parallel to the optical axis to achieve the focusing function.

[0063] Furthermore, the fixed frame 10 is movably mounted on other frames to achieve the anti-shake function. The anti-shake structure can be specifically implemented as a piezoelectric motor, a voice coil motor, or a shape memory alloy motor, etc. Among them, the structure of the piezoelectric motor can be optimized with reference to the improved scheme of the drive device of this application.

[0064] In some optional embodiments, such as Figure 4 As shown, the drive assembly 30 includes a pre-pressure assembly 31 and an actuation assembly 32. The pre-pressure assembly 31 is connected to the fixed frame 10, and the actuation assembly 32 is connected to the pre-pressure assembly 31. The pre-pressure assembly 31 provides a pre-pressure to the actuation assembly 32, causing the actuation assembly 32 to abut against one side of the movable carrier 20. The actuation assembly 32 includes a piezoelectric vibrator 322 and a friction head 323. The piezoelectric vibrator 322 is connected to the pre-pressure assembly 31, and the friction head 323 is fixed to the side of the piezoelectric vibrator 322 facing the movable carrier 20. Under the action of the pre-pressure, the friction head 323 abuts against the side wall of the movable carrier 20 to drive the movable carrier 20 to move relative to the fixed frame 10.

[0065] In some optional embodiments, the actuation component 32 further includes a piezoelectric circuit board, specifically a flexible circuit board 321, abbreviated as FPC. The piezoelectric circuit board is connected to the piezoelectric vibrator 322 to provide power and drive signals to the piezoelectric vibrator 322. Specifically, the piezoelectric circuit board can be disposed on the side of the piezoelectric vibrator 322 facing away from the movable carrier 20.

[0066] In some optional embodiments, the pre-pressure component 31 is disposed on the side of the piezoelectric vibrator 322 facing away from the movable carrier 20, so as to provide a pre-pressure for pressing the friction head 323 disposed on the side of the piezoelectric vibrator 322 facing the movable carrier 20 onto the movable carrier 20. Further, when the actuation component 32 includes a piezoelectric circuit board, the piezoelectric circuit board may be disposed between the piezoelectric vibrator 322 and the pre-pressure component 31.

[0067] In some optional embodiments, the first support member 41 is specifically implemented as a row of balls. Under the action of the pre-compression component 31, multiple balls are clamped between the fixed frame 10 and the movable carrier 20. The balls and the movable carrier 20 are in point contact. The multiple balls provide support force for the movable carrier 20, so that the movable carrier 20 is supported in parallel and stably on the fixed frame 10.

[0068] In another optional embodiment, considering the risk of ball bearing jamming when the movable carrier 20 is tilted relative to the fixed frame 10, and the uncertainty of the ball bearing's motion state due to the sliding friction between the ball bearing and the fixed frame 10 and the movable carrier 20, the ball bearing may be in a rolling state or a sliding state, and the ball bearing can switch motion states at will, increasing the risk of jamming. Furthermore, the ball bearing may also detach, rub against or impact the movable carrier 20 and the fixed frame 10, generating debris that could cause the ball bearing to jam. In other words, when the support component 40 is set as a ball bearing, there is a defect of uncertain friction and easy jamming, which will affect the focusing effect. As an improvement, in some embodiments, the first support member 41 is specifically implemented as a guide rod.

[0069] The second support member 42 may have the same structure as the first support member 41, or it may be different. In some optional embodiments, the second support member 42 is a ball bearing; in other optional embodiments, the second support member 42 is a guide rod.

[0070] In this embodiment, both the first support member 41 and the second support member 42 are guide rods. The two guide rods are parallel to each other and extend along the optical axis to ensure consistency between the first support member 41 and the second support member 42. When the guide rods abut against the fixed frame 10 and the movable carrier 20, they are in line contact. When the driving assembly 30 drives the movable carrier 20 to move relative to the fixed frame 10 along the optical axis, the guide rods can always support the movable carrier 20. Under the support of the guide rods, the movable carrier 20 is less likely to tilt, and there is less chance of jamming between the movable carrier 20 and the guide rods. This reduces the risk of the movable carrier 20 tilting and thus avoids affecting the optical focusing function.

[0071] In some optional embodiments, the fixed frame 10 and / or the movable carrier 20 are provided with a limiting structure for the support component 40 to prevent the support component 40 from falling off between the two opposing abutment surfaces of the fixed frame 10 and the movable carrier 20.

[0072] It should be noted that this application does not limit the support component 40 to be a ball, a guide rod or other structure, as long as it can support the movable carrier 20. For example, the support component 40 can also be implemented as a slider fixed to the movable carrier 20 or the fixed frame 10.

[0073] On the other hand, this application also improves the position of the drive assembly 30 and the support assembly 40 from the perspective of reducing the overturning moment M, by setting the support assembly 40 and the drive assembly 30 on the same side of the drive device, so as to further reduce the probability of the moving carrier 20 tilting.

[0074] contrast Figure 1 and Figure 3 Compared to the prior art where the friction heads 323 of the two support components 40 and the actuator component 32 are arranged at three points on the side wall of the movable carrier 20, the arrangement of the support components 40 and the drive component 30 on the same side of the drive device reduces the distance between the friction head 323 of the actuator component 32 and the line connecting the two support components 40, i.e., x becomes smaller, thus reducing the overturning moment M acting on the movable carrier 20. When the movable carrier 20 is driven to move by the actuator component 32, the tilt angle of the movable carrier 20 is smaller, reducing the risk of the movable carrier 20 tilting and the support components 40 jamming, and avoiding affecting the optical focusing effect. Furthermore, the support component 40 is disposed between the fixed frame 10 and the movable carrier 20, so that there is a fixed gap between the opposing surfaces of the fixed frame 10 and the movable carrier 20. The support component 40 can change the contact mode between the fixed frame 10 and the movable carrier 20, such as point contact or line contact. Compared with the way friction is generated by direct surface contact between the fixed frame 10 and the movable carrier 20, the friction contact area is reduced, thus reducing the friction force on the movable carrier 20 when it moves relative to the fixed frame 10, and the movable carrier 20 is easier to drive.

[0075] Furthermore, the arrangement of the support assembly 40 and the drive assembly 30 on the same side of the drive device includes two implementations: one is that the first support member 41 and the second support member 42 are located on the same side of the drive assembly 30, and the other is that the first support member 41 and the second support member 42 are located on opposite sides of the drive assembly 30. Both implementations can reduce the distance from the friction head 323 of the drive assembly 30 to the line connecting the first support member 41 and the second support member 42, thus reducing the overturning arm x of the movable carrier 20.

[0076] In this embodiment, such as Figure 3 As shown, the first support member 41 and the second support member 42 are located on the same side of the drive assembly 30. Furthermore, the first support member 41 is closer to the drive assembly 30 than the second support member 42. Given that the first support member 41 is tightly fitted and the second support member 42 is loosely fitted, and the movable carrier 20 is not tilted, the distance from the friction head 323 of the drive assembly 30 to the first support member 41 is the lever arm x of the overturning moment M of the movable carrier 20. The closer the first support member 41 is to the drive assembly 30, the smaller the lever arm x, and the smaller the overturning moment M.

[0077] Furthermore, along the preload direction, the first support member 41, the second support member 42, and the drive assembly 30 are arranged in a straight line. In other words, the center of the friction head 323, the center of the first support member 41, and the center of the second support member 42 are located on a straight line. Therefore, the distance from the friction head 323 of the drive assembly 30 to the line connecting the first support member 41 and the second support member 42 is the distance from the friction head 323 to the first support member 41. Even when the movable carrier 20 has tilted, the distance from the friction head 323 to the first support member 41 is the lever arm x corresponding to the overturning moment M of the movable carrier 20. When the drive assembly 30 drives the movable carrier 20, the magnitude of the overturning moment M acting on the movable carrier 20 is positively correlated with the value of the lever arm x. This application reduces the value of x, thereby reducing the value of the overturning moment M and solving the problem of the movable carrier 20 tilting or even jamming.

[0078] Of course, in some optional embodiments, such as Figure 10As shown, the first support member 41, the second support member 42, and the drive assembly 30 may not be arranged in a straight line. That is, the center of the friction head 323, the center of the first support member 41, and the center of the second support member 42 may be misaligned. As long as the drive assembly 30, the first support member 41, and the second support member 42 are arranged adjacent to each other, the distance between the friction head 323 and the line connecting the first support member 41 and the second support member 42 can be reduced. Reducing the distance between the friction head 323 and the line connecting the first support member 41 and the second support member 42 is equivalent to reducing the values ​​of the lever arm x and the overturning moment M, which can reduce the risk of the movable carrier 20 tilting relative to the fixed frame 10, prevent the movable carrier 20 and the support assembly 40 from jamming, and thus allow the movable carrier 20 carrying the lens assembly to be adjusted smoothly, which is beneficial to improving the imaging quality of the corresponding camera module.

[0079] In some embodiments, such as Figure 11 As shown, the first support member 41 and the second support member 42 are located on both sides of the drive assembly 30.

[0080] To make the solution of this application easier to understand, the specific structure related to the assembly of the support component 40 is given below.

[0081] Combination Figures 6-9 As shown, in some optional embodiments, the movable carrier 20 includes a first outward protrusion 21, and the fixed frame 10 includes a first inward protrusion 11. The first outward protrusion 21 and the first inward protrusion 11 are disposed opposite to each other, and the first support member 41 is disposed between the first outward protrusion 21 and the first inward protrusion 11. The arrangement of the first outward protrusion 21 and the first inward protrusion 11 can provide assembly space for the first support member 41.

[0082] Furthermore, in this embodiment, the fixed frame 10 is provided with a first external recess 12 corresponding to the first external protrusion 21, and the movable carrier 20 is provided with a first internal recess 22 corresponding to the first internal protrusion 11. The first external protrusion 21 is adapted to be inserted into the first external recess 12, and the first internal protrusion 11 is adapted to be inserted into the first internal recess 22. This arrangement helps to reduce the size of the entire driving device in the direction perpendicular to the optical axis.

[0083] In some optional embodiments, the first outward protrusion 21 is provided with a first guide portion 211, and the first inward protrusion 11 is provided with a second guide portion 112. The two sides of the first support member 41 respectively abut against the first guide portion 211 and the second guide portion 112. The first guide portion 211, the second guide portion 112, and the first support member 41 cooperate to guide the movable carrier 20 to move along a first direction. It should be understood that the first direction here is the direction parallel to the optical axis. In other words, due to the provision of the first guide portion 211 and the second guide portion 112, the first support member 41 not only supports the movable carrier 20 but also guides the movable carrier 20 to move along the direction parallel to the optical axis, thus positioning the movable carrier 20.

[0084] Specifically, both the first guide portion 211 and the second guide portion 112 are implemented as guide grooves extending in a direction parallel to the optical axis. The openings of the two guide grooves are arranged opposite each other. The support component 40 extends in a direction parallel to the central axis O and is clamped and limited by the guide grooves on both sides. The support component 40 is continuously clamped in the guide grooves on both sides. When the drive component 30 applies a driving force to the movable carrier 20, due to the restriction of the first guide portion 211 and the second guide portion 112, the first support member 41 can only move relative to the fixed frame 10 and / or the movable carrier 20 in a direction parallel to the optical axis, guiding the movable carrier 20 to move in a direction parallel to the optical axis and reducing the possibility of the movable carrier 20 tilting.

[0085] More specifically, in this embodiment, the first support member 41 is a cylindrical guide rod, and the first guide portion 211 and the second guide portion 112 are V-shaped grooves, which clamp and limit the guide rod. The structure is simple and easy to assemble. In other embodiments of this application, the first guide portion 211 and the second guide portion 112 may also be configured as U-shaped grooves or other structures, and this application does not limit this.

[0086] In some optional embodiments, the movable carrier 20 further includes a second outward protrusion 23, and the fixed frame 10 further includes a second inward protrusion 13. The second outward protrusion 23 and the second inward protrusion 13 are disposed opposite to each other, and the second support member 42 is disposed between the second outward protrusion 23 and the second inward protrusion 13. The arrangement of the second inward protrusion 13 and the second outward protrusion 23 can provide assembly space for the second support member 42.

[0087] Furthermore, in this embodiment, the fixed frame 10 is provided with a second outer recess 14 corresponding to the second outer protrusion 23, and the movable carrier 20 is provided with a second inner recess 24 corresponding to the second inner protrusion 13. The second outer protrusion 23 is adapted to be inserted into the second outer recess 14, and the second inner protrusion 13 is adapted to be inserted into the second inner recess 24. This arrangement helps to reduce the size of the entire driving device in the direction perpendicular to the optical axis.

[0088] In some optional embodiments, the second outward protrusion 23 is provided with a third guide portion 233, the second inward protrusion 13 is provided with a fourth guide portion 134, and the second support member 42 is disposed between the third guide portion 233 and the fourth guide portion 134. Furthermore, a gap is left between the second support member 42 and the third guide portion 233 and / or the fourth guide portion 134, forming a loose fit.

[0089] The third guide section 233, the fourth guide section 134, and the second support member 42 cooperate to provide adjustment space for the movable carrier 20. When the movable carrier 20 tilts to a certain degree, the second support member 42 abuts against the third guide section 233 and the fourth guide section 134 respectively, preventing the movable carrier 20 from tilting further and correcting the angle of the movable carrier 20.

[0090] Specifically, both the third guide portion 233 and the fourth guide portion 134 are implemented as guide grooves extending in a direction parallel to the optical axis. The openings of the two guide grooves are arranged opposite each other. The support assembly 40 extends in a direction parallel to the central axis O and is arranged between the guide grooves on both sides. When the movable carrier 20 tilts to a certain angle, the second support member 42 abuts against the third guide portion 233 and the fourth guide portion 134. Due to the restriction of the third guide portion 233 and the fourth guide portion 134, the second support member 42 can only move relative to the fixed frame 10 and / or the movable carrier 20 in a direction parallel to the optical axis, thereby guiding the movable carrier 20 to move in a direction parallel to the optical axis, correcting the movable carrier 20, and reducing the possibility of the movable carrier 20 tilting.

[0091] More specifically, in this embodiment, the second support member 42 is a cylindrical guide rod, and the third guide portion 233 and the fourth guide portion 134 are V-grooves. The structure is simple and easy to assemble. In other embodiments of this application, the third guide portion 233 and the fourth guide portion 134 may also be configured as U-grooves or other structures; this application does not impose any limitations on this.

[0092] Furthermore, the drive assembly 30 is disposed between the first protrusion 21 and the fixed frame 10, specifically on the side of the first protrusion 21 facing away from the first support member 41, so as to further shorten the distance between the drive assembly 30 and the line connecting the first support member 41 and the second support member 42, that is, to reduce the lever arm x and thereby reduce the overturning moment M of the movable carrier 20.

[0093] In this embodiment, the first support member 41 and the drive assembly 30 are disposed on opposite sides of the first outward protrusion 21, and in the pre-pressure direction, the center of the drive assembly 30, the center of the first support member 41, and the center of the second support member 42 are aligned in a straight line. This means that the arrangement of the first outward protrusion 21, the first inward protrusion 11, the second outward protrusion 23, and the second inward protrusion 13 allows the drive assembly 30 and the support assembly 40 to be disposed on the same side of the drive device. In particular, it facilitates the alignment of the first support member 41, the second support member 42, and the drive assembly 30 in the pre-pressure direction.

[0094] In some optional embodiments, both the first support member 41 and the second support member 42 are guide rods. The guide rods are arranged along a first direction, and along the first direction, the movable carrier 20 is provided with at least two protrusions 201 spaced apart to contact the guide rods. The movable carrier 20 abuts against the guide rods through the protrusions 201, and a relative depression is formed between two adjacent protrusions 201. The depression does not contact the guide rod, which can reduce the frictional contact area between the movable carrier 20 and the guide rod, and reduce the frictional resistance experienced by the movable carrier 20 during movement. The protrusions 201 are spaced apart along the length direction of the guide rod to support the guide rod at at least two points or two areas along the length direction of the guide rod, so that the guide rod can be supported stably.

[0095] Preferably, both the first protrusion 21 and the second protrusion 23 are provided with protrusions 201 to reduce the frictional force exerted by the first support member 41 and the second support member 42 on the movable carrier 20, making the movable carrier 20 easier to drive.

[0096] In some optional embodiments, the protrusion height of each protrusion 201 is consistent in order to keep the length direction of the guide rod parallel to the optical axis.

[0097] In some optional embodiments, the movable carrier 20 is provided with two protrusions 201, and the two protrusions 201 are located at both ends of the movable carrier 20. The middle part of the movable carrier 20 is relatively recessed to separate it from the middle part of the support assembly 40. The purpose of reducing the frictional contact area and stably supporting the guide rod is achieved with a minimum number of protrusions 201, and the structure is relatively simple and easy to process and form.

[0098] It is understood that when the first support member 41 and the second support member 42 are assembled through the aforementioned first outward protrusion 21, first inward protrusion 11, second outward protrusion 23, and second inward protrusion 13, the protrusion 201 is provided on the first outward protrusion 21 and / or the second outward protrusion 23. Furthermore, the protrusion 201 does not contradict the first guide portion 211 and the third guide portion 233. For example, in this embodiment, both the first guide portion 211 and the third guide portion 233 are V-shaped grooves. The V-shaped groove contacts the guide rod via its two side walls. The middle of the two side walls of the V-shaped groove is recessed downwards to avoid contact with the guide rod. The upper and lower ends of the two side walls of the V-shaped groove protrude along the direction perpendicular to the optical axis, forming the so-called protrusion 201.

[0099] This application also improves the structure of the drive component 30 to reduce the probability of the active carrier 20 tilting.

[0100] like Figure 4 As shown, the drive assembly 30 includes a pre-pressure assembly 31 and an actuation assembly 32. The pre-pressure assembly 31 is connected to the fixed frame 10, and the actuation assembly 32 is connected to the pre-pressure assembly 31. The pre-pressure assembly 31 provides a pre-pressure to the actuation assembly 32, so that the drive end of the actuation assembly 32 abuts against the movable carrier 20 and applies the pre-pressure to the movable carrier 20. Thus, the actuation assembly 32 is adapted to drive the movable carrier 20 to move relative to the fixed frame 10 when a drive signal is received.

[0101] In some optional embodiments, the actuation component 32 includes a piezoelectric vibrator 322 and a friction head 323. The piezoelectric vibrator 322 is connected to the pre-pressure component 31, and the friction head 323 is fixed on the side of the piezoelectric vibrator 322 facing the movable carrier 20. Under the action of the pre-pressure, the friction head 323 abuts against the side wall of the movable carrier 20 and drives the movable carrier 20 to move as the driving end of the actuation component 32.

[0102] In some optional embodiments, such as Figure 12 As shown, the actuation component 32 also includes a flexible circuit board 321, which is disposed between the preload component 31 and the piezoelectric vibrator 322.

[0103] In some optional embodiments, the pre-compression component 31 is an elastic structure, such as a spring sheet 310. Specifically, the spring sheet 310 can be glued to the actuation component 32.

[0104] In some optional embodiments, considering that the spring 310 will deform with the piezoelectric vibrator 322, causing the preload to tilt onto the movable carrier 20, and thus causing the movable carrier 20 to tilt, the preload assembly 31 is improved: the preload assembly 31 includes a structural member 311 and a buffer member 312. The structural member 311 is connected to the fixed frame 10, and the buffer member 312 is disposed between the structural member 311 and the actuation assembly 32, and is adapted to deform under the pressure of the structural member 311 and the actuation assembly 32. In other words, the actuation assembly 32 is attached to the structural member 311 through the buffer member 312.

[0105] In the prior art, the pre-pressure component 31 deforms and bends, causing the actuation component 32 to tilt relative to the movable carrier 20. The tilting of the pre-pressure on the movable carrier 20 causes it to tilt as well, resulting in inconsistent movement speeds of the actuation component 32 driving the movable carrier 20 relative to the fixed frame 10 in two opposite directions, affecting the driving effect of the drive device. This application improves the structure of the pre-pressure component 31, so that the structural component 311 will not deform significantly under the action of pre-pressure, preventing the actuation component 32 from tilting relative to the movable carrier 20, improving the driving effect of the drive device, and thus improving the shooting effect of the camera module. Since the buffer component 312 is deformable, placing the buffer component 312 between the structural component 311 and the actuation component 32 allows the deformation of the buffer component 312 to offset at least part of the changes in the magnitude of the pre-pressure caused by material tolerances and assembly tolerances during the assembly of the drive device, thereby improving the consistency of the pre-pressure in multiple drive devices of the same batch. Furthermore, this invention addresses the problem that the piezoelectric vibrator 322 and the spring sheet 310 in the actuation assembly 32 form a rigid whole due to the large elastic modulus of adhesives such as UV glue or thermosetting glue after curing, which affects the vibration mode of the piezoelectric vibrator 322 and thus the driving effect. The buffer 312 of this application can absorb part of the deformation of the piezoelectric vibrator 322, which helps to maintain the setting angle of the piezoelectric vibrator 322 relative to the moving carrier 20, so that the actual motion state of the piezoelectric vibrator 322 is close to the design value, and reduces the influence of external environment, such as the deformation of the pre-compression assembly 31, on the motion of the piezoelectric vibrator 322.

[0106] Specifically, the movable carrier 20 is disposed within the fixed frame 10. The fixed frame 10 has an opening 15 extending through both its inner and outer sides. A structural member 311 is disposed on the outer side of the fixed frame 10, and the structural member 311 is larger than the opening 15 in at least one direction, allowing it to be fixed to the outside of the fixed frame 10. A buffer member 312 and an actuating assembly 32 pass through the opening 15, allowing the actuating assembly 32 to abut against the movable carrier 20. It should be understood that the length and width of the opening 15 are greater than or equal to the length and width of the actuating assembly 32 and the buffer member 312, allowing them to pass through and abut against the movable carrier 20. The piezoelectric vibrator 322 is housed within the opening 15, reducing the size increase caused by external placement of the piezoelectric vibrator 322 and thus reducing the overall size of the drive device. It should be further explained that, in this application, the dimensions of each component such as the buffer 312 and the piezoelectric vibrator 322 in the drive assembly 30, and the opening 15 on the fixed frame 10, refer to the size of each component projected onto the structural component 311 along the installation direction between the actuation assembly 32, the buffer 312, and the structural component 311.

[0107] Among them, structural component 311 can be fixed to the outer side of fixed frame 10 by means of welding, hot riveting, bonding, etc.

[0108] The buffer 312 is in the form of a thin sheet, and its two sides are parallel to the actuation component 32 and the structural component 311 respectively. That is, the outer side and the inner side of the buffer 312 are arranged parallel to each other. The side of the structural component 311 facing the buffer 312 is a plane, which is connected to the outer side of the fixed frame 10 and the actuation component 32. Thus, the actuation component 32 can be attached to the structural component 311 in a parallel manner, maintaining the parallelism of the actuation component 32 with respect to the movable carrier 20 and the fixed frame 10, so that the actuation component 32 is arranged parallel between the movable carrier 20 and the fixed frame 10.

[0109] In some optional embodiments, the buffer 312 can be implemented as adhesive tape, with its two opposing surfaces bonded to the structural component 311 and the actuation component 32, respectively. Adhesive tape bonding has at least three advantages over adhesive bonding: First, it avoids the use of high-elasticity modulus adhesives, such as UV adhesives with an elastic modulus of at least 1 GPa after curing, as these high-elasticity modulus adhesives would affect the deformation of the buffer 312 and the piezoelectric vibrator 322. Second, it is simple to operate, as the actuation component 32 can be directly attached to the structural component 311 without the need for adhesive application and curing. Third, the tape has relatively good parallelism, providing two parallel opposing surfaces for bonding the actuation component 32 and the structural component 311, which helps improve the parallelism of the actuation component 32 relative to the fixed frame 10 and the movable carrier 20.

[0110] Furthermore, this application provides a brief explanation of the working principle of the piezoelectric vibrator 322 in some embodiments.

[0111] Reference Figure 12 , Figure 13 As shown, for ease of description, the thickness direction of the piezoelectric vibrator 322 is taken as the up-down direction, the length direction of the piezoelectric vibrator 322 is taken as the left-right direction, and the width direction is taken as the front-back direction.

[0112] The piezoelectric vibrator 322 has a multi-layer stacked structure. Specifically, the piezoelectric vibrator 322 is stacked in the thickness direction in the order of ceramic layer, electrode layer, ceramic layer, electrode layer... ceramic layer, electrode layer, ceramic layer. Each electrode layer is disposed between two adjacent ceramic layers, and the upper half and lower half of the piezoelectric vibrator 322 adopt opposite polarization methods.

[0113] The piezoelectric vibrator 322 has four side electrodes, designated as the first side electrode 3221, the second side electrode 3222, the third side electrode 3223, and the fourth side electrode 3224. The first side electrode 3221 and the second side electrode 3222 are arranged opposite each other on the left side of the piezoelectric vibrator 322, while the third side electrode 3223 and the fourth side electrode 3224 are arranged opposite each other on the right side of the piezoelectric vibrator 322. The first side electrode 3221 and the second side electrode 3222 are located on the left and right sides of the front of the piezoelectric vibrator 322, and are respectively suitable for receiving two electrical signals of the same frequency but different phases, for example... Figure 13 The X and Y signals are located on the left and right sides behind the piezoelectric vibrator 322, and the second side electrode 3222 and the fourth side electrode 3224 are respectively grounded.

[0114] It is easy to understand that the access signal and grounding of the side electrode are achieved through electrical connection with the flexible circuit board 321.

[0115] All four side electrodes extend along the thickness direction of the piezoelectric oscillator 322 and are electrically connected sequentially to the uppermost electrode layer, several intermediate electrode layers, and the lowermost electrode layer, thereby generating an electric field between adjacent electrode layers. Under the action of this electric field, the ceramic layer undergoes elongation or contraction deformation. Figure 13 The arrows pointing in opposite directions indicate contraction, while those pointing away indicate extension. Through a multi-layered stacked structure, the electric fields formed between adjacent electrode layers are superimposed in the vertical direction. Therefore, the voltage required to drive the entire piezoelectric oscillator 322 to bend and vibrate is reduced. The number of electrode layers and ceramic layers can be designed according to the specific driving force and voltage requirements.

[0116] To more clearly explain the working principle of the piezoelectric vibrator 322, based on the above setup, the piezoelectric vibrator 322 is divided into an upper left section, an upper right section, a lower left section, and a lower right section. When an electrical signal is applied to the side electrode, four time points from t1 to t4 are observed. The piezoelectric vibrator 322 generates the following at t1, t2, t3, and t4 respectively: Figure 13 The diagram illustrates four deformation states. At time t1, the upper left and upper right segments contract, while the lower left and lower right segments extend. The piezoelectric vibrator 322 bends upward, and the friction head 323 moves relatively downward. At time t2, the upper left and lower right segments contract again, while the lower left and upper right segments extend. Consequently, the piezoelectric vibrator 322 bends upward on the left and downward on the right, and the friction head 323 moves upward to the left. At times t3 and t4, the friction head 323 first moves upward and then downward to the right. At the next input electrical signal at the same time as t1, the friction head 323 moves downward to the same position as t1. The piezoelectric vibrator 322 switches between these four deformation states, causing the friction head 323, fixed to the upper surface of the piezoelectric vibrator 322, to produce an elliptical motion as shown in the diagram. The friction head 323 then drives the movable carrier 20 to move via high frequency.

[0117] This application can also provide an actuator component 32 with another structure, such as Figure 14 As shown, it includes a piezoelectric vibrator 322 and a friction head 323. The piezoelectric vibrator 322 includes a first end face 3241 and a second end face 3242 facing away from each other. The first end face 3241 includes at least two electrode regions. At least one of the at least two electrode regions is used to be applied an AC excitation signal to cause the piezoelectric vibrator 322 to generate a bending-shear characteristic mode. The second end face 3242 is used to fix it to the surface to be installed, that is, the pre-pressing component 31. The piezoelectric vibrator 322 is polarized along the direction from the first end face 3241 to the second end face 3242. The friction head 323 is disposed on the first end face 3241 and connected to the at least two electrode regions. The friction head 323 serves as the driving end of the actuation component 32 and is used to make frictional contact with the movable carrier 20 to drive the movable carrier 20 to move when the piezoelectric vibrator 322 generates the bending-shear characteristic mode.

[0118] In some embodiments, to improve the driving performance of the driving component 30, the piezoelectric oscillator 322 can be made of piezoelectric ceramic material or piezoelectric single crystal material. The piezoelectric oscillator 322 can be a single-layer ceramic body or a single-layer single crystal, or it can be a multi-layer ceramic body or a multi-layer single crystal, such as lead zirconate titanate (PZT) based piezoelectric ceramics, potassium sodium niobate (KNN) based piezoelectric ceramics, barium titanate (BT) based piezoelectric ceramics, lead magnesium niobate-lead indium niobate (PMN-PT) based piezoelectric single crystals, etc.

[0119] In some embodiments, the friction head 323 is made of wear-resistant materials, such as various high-hardness wear-resistant ceramic materials, such as alumina, zirconium oxide, silicon carbide ceramics, or high-wear-resistant metal materials, carbon fiber materials, or composite materials of ceramics, metal particles and polymers, etc., in order to improve the wear resistance of the friction head 323, which is beneficial to improve the friction between the moving carrier 20 and the friction head 323, that is, to improve the driving force, and due to the wear resistance, it is beneficial to extend the service life of the friction head 323.

[0120] Conversely, in some embodiments, reference is made to... Figure 4 , Figure 5 As shown, the movable carrier 20 is provided with a wear-resistant part 26, and the friction head 323 abuts against the wear-resistant part 26. Specifically, the wear-resistant part 26 can be a wear-resistant coating, or a friction-resistant plate assembled on the movable carrier 20 by means of bonding, insert injection molding, etc., or a structure that can achieve friction resistance, such as the uneven outer surface of the movable carrier 20. The setting of the wear-resistant part 26 is conducive to improving the friction between the movable carrier 20 and the friction head 323, that is, it is conducive to improving the driving force, and due to wear resistance, it is conducive to extending the service life.

[0121] Furthermore, when the wear-resistant part 26 is set as a friction-resistant plate, it can be fixed to the movable carrier 20 by means of bonding, fastener connection, insert injection molding, etc., so as to form an integral force-bearing structure with the movable carrier 20. And referring to the material of the friction head 323, the friction-resistant plate can be made of the same or different wear-resistant material as the friction head 323.

[0122] It is understood that this application does not impose specific limitations on the specific shapes of the friction head 323 and the friction-resistant plate. In specific embodiments, the shape of the friction head 323 can be a sphere, hemisphere, cuboid, frustum, cylinder, semi-cylinder, etc., and the friction-resistant plate can be sheet-like or block-like. In one example of this application, the friction head 323 is cylindrical, and the cylindrical friction head 323 is placed vertically, or as... Figure 12 As shown, it is placed horizontally on the piezoelectric vibrator 322 to provide line friction between the drive assembly 30 and the movable carrier 20. The friction head 323 is in line contact with the wear-resistant part 26 of the movable carrier 20. Compared with point contact, it has greater friction and better driving force and driving effect.

[0123] The number of friction heads 323 can be one, two, or more. In this embodiment, the piezoelectric vibrator 322 is rectangular, and the friction head 323 protrudes from the center of the side of the piezoelectric vibrator 322 facing the movable carrier 20, thereby increasing the unit driving stroke of the friction head 323. In another embodiment, there are two friction heads 323, which are spaced apart along the length of the piezoelectric vibrator 322, and the length of the piezoelectric vibrator 322 is parallel to the direction of movement of its driving movable carrier 20. At least two friction heads 323 are provided on the side of the piezoelectric vibrator 322 facing the movable carrier 20 along the driving direction of the driving assembly 30, thereby increasing the driving stroke.

[0124] In some embodiments, the friction head 323 and the piezoelectric vibrator 322 can be an integral structure or a detachable structure. The friction head 323 and the piezoelectric vibrator 322 can be fixed to the piezoelectric vibrator 322 by means of bonding, snapping, nesting, welding or fastener connection. The friction head 323 and the piezoelectric vibrator 322 are in surface contact to ensure connection strength. The friction head 323 can produce obvious movement with the deformation of the piezoelectric vibrator 322.

[0125] This application also provides a camera module, comprising: the aforementioned driving device, lens assembly, and photosensitive assembly, wherein the lens assembly is disposed within the driving device, and the photosensitive assembly is disposed relative to the lens assembly. Because the movable carrier 20 carrying the optical lens can be smoothly adjusted, focusing is facilitated, thereby improving image quality.

[0126] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A driving device applied to a camera module, characterized in that, include: Fixed frame; An active carrier, which is movably disposed on the fixed frame; A drive assembly is connected to the fixed frame and abuts against the movable carrier, applies a preload to the movable carrier, and is adapted to drive the movable carrier to move relative to the fixed frame when a drive signal is received. A support assembly includes a first support member and a second support member. The first support member abuts against the fixed frame and the movable carrier respectively. The second support member has a certain gap with the fixed frame and / or the movable carrier. The first support member is tightly fitted, and the second support member is loosely fitted. The support assembly and the drive assembly are disposed on the same side of the drive device, wherein the first support member and the second support member are located on the same side of the drive assembly, and the first support member is closer to the drive assembly than the second support member.

2. The driving device as described in claim 1, characterized in that: Along the preload direction, the first support member, the second support member, and the drive assembly are arranged in a straight line.

3. The driving device as described in claim 1, characterized in that: The movable carrier includes a first outward protrusion, the fixed frame includes a first inward protrusion, the first outward protrusion and the first inward protrusion are disposed opposite to each other, and the first support member is disposed between the first outward protrusion and the first inward protrusion.

4. The driving device as described in claim 3, characterized in that: The first outward protrusion is provided with a first guide portion, and the first inward protrusion is provided with a second guide portion. The two sides of the first support member abut against the first guide portion and the second guide portion respectively. The first guide portion, the second guide portion and the first support member cooperate to guide the movable carrier to move along the first direction.

5. The driving device as described in claim 3 or 4, characterized in that: The movable carrier further includes a second outward protrusion, and the fixed frame further includes a second inward protrusion. The second outward protrusion and the second inward protrusion are disposed opposite to each other, and the second support member is disposed between the second outward protrusion and the second inward protrusion.

6. The driving device as described in claim 5, characterized in that: The second outward protrusion is provided with a third guide portion, the second inward protrusion is provided with a fourth guide portion, and the second support member is disposed between the third guide portion and the fourth guide portion. The third guide portion, the fourth guide portion and the second support member cooperate to provide a certain space for the adjustment of the movable carrier.

7. The driving device as claimed in claim 1, characterized in that: Both the first support member and the second support member are guide rods, which are arranged along a first direction. Along the first direction, the movable carrier is provided with at least two protrusions at intervals that are suitable for contacting the guide rods.

8. The driving device as claimed in claim 1, characterized in that: The driving component includes a pre-pressure component and an actuation component. The pre-pressure component is connected to the fixed frame, and the actuation component is connected to the pre-pressure component. The pre-pressure component provides pre-pressure to the actuation component, causing the driving end of the actuation component to abut against the movable carrier and apply the pre-pressure to the movable carrier. Thus, the actuation component is adapted to drive the movable carrier to move relative to the fixed frame when a driving signal is received.

9. The driving device as described in claim 8, characterized in that: The pre-compression assembly includes a structural component and a buffer component. The structural component is connected to the fixed frame, and the buffer component is disposed between the structural component and the actuation assembly and is adapted to be deformed by the compression of the structural component and the actuation assembly.

10. A camera module, characterized in that, include: The drive device as described in any one of claims 1-9; The lens assembly is disposed in the drive device; as well as The photosensitive component is positioned relative to the lens component.

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